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LE2416RDXATDG Datasheet(PDF) 9 Page - ON Semiconductor |
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LE2416RDXATDG Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 17 page LE2416RDXA www.onsemi.com 9 4) Acknowledge Bit (ACK) The Acknowledge Bit is used to indicate a successful byte data transfer. The receiver sends a zero to acknowledge that it has received each word (Device Code, Slave Address etc) from the transmitter. 5) Device addressing To transmit between the bus master and slave device (EEPROM), the master must send a Start condition to the EEPROM. The device address word of the EEPROM consists of 4-bit Device Code, 3-bit Memory address and 1-bit read/write code. By sending these, it becomes possible to communicate between the bus master and the EEPROM. The upper 4-bit of the device address word are called the Device Code, the Device Code of the EEPROM uses 1010b fixed code. This device does not have the Slave address. When the Device Code and Memory address (A10, A9, A8) are received on the SDA, the device only responds. The 8 th bit is the read/write bit. The bit is set to 1 for Read operation and 0 for Write operation. If a match occurs on the Device Code, the corresponding device gives an acknowledgement on SDA during the 9 th bit time. If device does not match the Device Code, it deselects itself from the bus, and goes into the Standby mode. 1 0 1 0 A10 A9 A8 R/W Device Code Memory Address MSB LSB Device address word Acknowledge Bit output Start condition 1 SCL (From Transmitter) SDA (From Transmitter) SDA (EEPROM output) 8 9 tAA tDH |
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